tk tk tk tk tk
tk tk tk tk tk .
t̪̻ k WORD_BOUNDARY t̪̻ k WORD_BOUNDARY t̪̻ k WORD_BOUNDARY t̪̻ k WORD_BOUNDARY t̪̻ k WORD_BOUNDARY
t k WORD_BOUNDARY t k WORD_BOUNDARY t k WORD_BOUNDARY t k WORD_BOUNDARY t k WORD_BOUNDARY . WORD_BOUNDARY